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CMP82C55AZ датащи(PDF) 10 Page - Renesas Technology Corp

номер детали CMP82C55AZ
подробное описание детали  CMOS Programmable Peripheral Interface
PDF  26 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
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CMP82C55AZ датащи(HTML) 10 Page - Renesas Technology Corp

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MS82C55A, MQ82C55A, MP82C55A
FN6140 Rev 2.00
Page 10 of 26
June 15, 2006
ACK - (Acknowledge Input). A “low” on this input informs the
82C55A that the data from Port A or Port B is ready to be
accepted. In essence, a response from the peripheral device
indicating that it is ready to accept data, (See Note 1).
INTR - (Interrupt Request). A “high” on this output can be used
to interrupt the CPU when an output device has accepted data
transmitted by the CPU. INTR is set when ACK is a “one”, OBF
is a “one” and INTE is a “one”. It is reset by the falling edge of
WR.
INTE A
Controlled by Bit Set/Reset of PC6.
INTE B
Controlled by Bit Set/Reset of PC2.
NOTE:
1. To strobe data into the peripheral device, the user must operate the
strobe line in a hand shaking mode. The user needs to send OBF
to the peripheral device, generates an ACK from the peripheral
device and then latch data into the peripheral device on the rising
edge of OBF.
FIGURE 6. MODE 1 INPUT
FIGURE 7. MODE 1 (STROBED INPUT)
1
D7
0
D6
1
D5
1
D4
1/0
D3 D2 D1 D0
CONTROL WORD
MODE 1 (PORT A)
PC4
8
IBFA
PC5
INTE
A
PA7-PA0
STBA
INTRA
PC3
PC6, PC7
I/O
2
RD
PC6, PC7
1 = INPUT
0 = OUTPUT
1
D7 D6 D5 D4 D3 D2 D1 D0
CONTROL WORD
MODE 1 (PORT B)
PC2
8
IBFB
PC1
INTE
B
PB7-PB0
STBB
INTRB
PC0
RD
11
tST
STB
INTR
RD
INPUT FROM
IBF
PERIPHERAL
tSIB
tSIT
tPH
tPS
tRIT
tRIB
FIGURE 8. MODE 1 OUTPUT
1
D7
0
D6
1
D5
1
D4
1/0
D3 D2 D1 D0
CONTROL WORD
MODE 1 (PORT A)
PC7
8
ACKA
PC6
PA7-PA0
OBFA
INTRA
PC3
PC4, PC5
2
WR
PC4, PC5
1 = INPUT
0 = OUTPUT
1
D7 D6 D5 D4 D3 D2 D1 D0
CONTROL WORD
MODE 1 (PORT B)
PC1
8
ACKB
PC2
INTE
B
PB7-PB0
OBFB
INTRB
PC0
WR
10
INTE
A



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